7
4. Utilizing an appropriate sized funnel, fill each desic-
cant tower as follows:
a. Install the required quantity of tower media in layer
1 of each tower.
b. Level layer 1 and each subsequent layer of desic-
cant as added to each tower.
c. Finish filling each tower with desiccant until all
desiccant has been installed. LIGHT tapping
on the tower sides with a soft-face mallet should
yield additional free space to allow installation of
all desiccant required.
DO NOT TAMP OR RAM
DESICCANT
.
5. Clean the fill port closure. Replace the fill plug using
Teflon tape or another pipe thread sealant suitable
for compressed air service. Reinstall fill port flange
cover (where applicable) in each desiccant tower.
Layer
Model
1
2
350
200#
1/4” bead AA*
—
450
200#
1/4” bead AA*
—
600
350#
1/4” bead AA*
—
800
350#
1/4” bead AA*
—
1025
450#
1/4” bead AA*
—
1300
575#
1/4” bead AA*
—
1500
675#
1/4” bead AA*
—
1800
90#
1/2” Bed Support
850#
1/4” bead AA*
2100
120#
1/2” Bed Support
925#
1/4” bead AA*
2400
120#
1/2” Bed Support
1075#
1/4” bead AA*
3250
180#
1/2” Bed Support
1375#
1/4” bead AA*
3700
300#
1/2” Bed Support
1625#
1/4” bead AA*
4425
5000
6100
7500
8500
10000
Consult Factory
* AA = Activated Alumina
TABLE 3
DESICCANT REQUIREMENTS
(Quantity per Tower)
5.0 Instrumentation
The following instrumentation helps in monitoring dryer
operation and performance. Instruments which are avail-
able as options are so noted.
Heat of Compression Air dryers are rated NEMA 4 and
include the following:
• Solid State Controls
• Tower Pressure Gauges
• Color Change Moisture Indicator
• Dryer Inlet, Left Tower, Right Tower & Dryer Outlet
Temperature Sensors
• Switch Failure Alarm (Option)
• Dew Point Transmitter (Option)
5.1 Controls
The solid-state dryer controls are located in a polycarbon-
ate, NEMA Class 4/4X, IP66 rated electrical enclosure
mounted to a center panel located between the two desic-
cant towers. Control features include:
• 15 LED’s to indicate operating status and fault condi-
tions.
• Two line text display to provide status and diagnostic
messages.
• Upon power loss, dryer “fails safe” (valves remain
in position). On power recovery, controller resumes
where power was lost.
5.2 Tower Pressure Gauges
Panel mounted gauges indicate pressure in each desic-
cant tower.
5.3 Color Change Moisture Indicator
A color-change moisture indicator mounted on the outlet
piping manifold that provides a constant visual indication
that dry gas is being supplied to the dryer outlet con-
nection. A sampling line installed at the dryer’s outlet,
supplies a small, continuous gas sample to the moisture
indicator for circulation.
As illustrated in Figure 2, the gas sample supplied from
the dryer outlet enters the moisture indicator’s inlet
connection (1), and circulates through a desiccant-filled
sight dome (2). The granular indicator (3), is a specially
treated “silica gel” which gradually changes from blue to
pink in color whenever a “wet” gas sample is received.
The color will return to blue when dry gas is once again
supplied to the dryer outlet. The indicator’s change